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Old 05-03-2017, 05:52 PM
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dbowie (Brenton)
Its just lens fever....

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Duncan mask

Hi anyone here used or using the Duncan mask method for SCT collimation, any hints, advice on design etc, seems to be pretty open ended, chrz
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Old 08-03-2017, 10:38 AM
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billdan (Bill)
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Hi Brenton,

I have done collimation with a Hartmann mask for my Newt, but found a barlow laser method easier and more accurate.

I do have this pdf on the Duncan mask though.
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File Type: pdf collimation_duncan mask.pdf (45.5 KB, 251 views)
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Old 08-03-2017, 05:36 PM
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Troy
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The Duncan mask is a good starting point for defocused collimation especially if you don't know how far to defocus the telescope before starting the collimation process.
For best results always collimate with a focused star
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Old 08-03-2017, 09:02 PM
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dbowie (Brenton)
Its just lens fever....

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Join Date: Apr 2016
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Posts: 115
Mask

Ok thnx for replies Ive collimated my C8 and 9.25 just using out of focus star with no probs but I spotted the Duncan mask on several other forums and thought an IIS member perspective would be good and perhaps a few people here might have been interested in the concept. Just found this, (http://www.iceinspace.com.au/index.p...63,187,0,0,1,0)
I see the Hartman is along the same lines. Im gonna make one anyway and try it, thnx..
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